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Introduction to Linux - A Hands on Guide

This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.

Outside of squirrelmail can you send email using just sendmail (such as with the mail command, or something like kmail, sylpheed, mutt, evolution, or any other mail client)? Are you having any other network problems? Can you post up your sendmail.cf (I believe that's what it is, I use postfix and love it ) so we can see if it's a configuration problem? Are you using an IMAP server? Which one? What distro? How did you install these things? Are you running your own DNS server?

i tried evolution ... my email does not get out ... same message
i have no network problem ...
i am using imap ... xinetd
i am running redhat 9.0
try and errors with red hat documentations
i am using my isp dns...